Blood sucking snail
Cancellaria cooperii is a marine snail which is commonly called the torpedo snail or Cooper's nutmeg snail.
This marine snail has acquired the taste for blood, although they only really feed off torpedo ray blood, so you are safe. They can smell torpedo rays from up to 24 meters away and when the torpedo ray cones in contact with the sea floor these little snails attach on. They drill into thei host with their razor sharp teeth and suck away.
The torpedo snail can be found in the East Pacific.
Species: Cancellaria cooperii